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"He loved boxing, and he always told me he would look after me when he made it big.

"He'll be still looking after me up there though. He always told me when he’s rolling in cash he would bring me with him.

"Honestly, words can’t even describe how much everyone will miss him – if you knew him you’d know what I mean – and I feel so much for his family and childhood friends Reece and Aaron.

"We're all devastated and no day or party will be the same without him, we love you Luke."

Luke O'Reilly O'Brien

Another friend wrote on social media: "Another young person taking way to soon, life can be very cruel, Luke you were a genuine and sound bloke, God only takes the best. RIP pal."

His former soccer club also paid tribute to Luke, who had planned on returning to play for them.

St Maelruans FC wrote: "St Maelruans FC would like to express their deepest sympathies to the family and friends of former player Luke O Reilly (20) who tragically passed away today in Beaumont Hospital.

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"Luke played alongside a number of our current Senior players at Underage level and had recently expressed an interest in re-joining the club.

"Luke’s death has come as a huge shock to us at the club, particularly to those who played alongside him.

Friends Brandon Hatton, James Blake, Conor Brock and Luke

"Our thoughts and prayers are with Luke’s family and friends at this difficult time.

"May he Rest In Peace."

Local priest Fr Michael Hurley said: "Our hearts go out to the family and the parish will be there to facilitate them in anything they may need."

A young man has been arrested in connection with the incident.

A Garda spokesman said: "A 20 year old man was arrested in the Tallaght area this afternoon in relation to this investigation and is currently detained at Tallaght Garda Station under the provisions of Section 4 – Criminal Justice Act 1984.